[PATCH 6.9 207/374] drm/msm/a6xx: Avoid a nullptr dereference when speedbin setting fails

Greg Kroah-Hartman
2024-06-06T14:10:02Z

From: Konrad Dybcio <konrad.dybcio@linaro.org>

[ Upstream commit 46d4efcccc688cbacdd70a238bedca510acaa8e4 ]

Calling a6xx_destroy() before adreno_gpu_init() leads to a null pointer
dereference on:

msm_gpu_cleanup() : platform_set_drvdata(gpu->pdev, NULL);

as gpu->pdev is only assigned in:

a6xx_gpu_init()
|_ adreno_gpu_init
|_ msm_gpu_init()

Instead of relying on handwavy null checks down the cleanup chain,
explicitly de-allocate the LLC data and free a6xx_gpu instead.

Fixes: 76efc2453d0e ("drm/msm/gpu: Fix crash during system suspend after unbind")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/588919/
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 441dfebb36386..7b72327df7f3f 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -3062,7 +3062,8 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)

ret = a6xx_set_supported_hw(&pdev->dev, config->info);
if (ret) {
- a6xx_destroy(&(a6xx_gpu->base.base));
+ a6xx_llc_slices_destroy(a6xx_gpu);
+ kfree(a6xx_gpu);
return ERR_PTR(ret);
}

--
2.43.0